Table 3 Subgroup-analysis by publication year, study design, and type of the procedure
Items | n | Â | Test for overall effect | Test for heterogeneity | ||
|---|---|---|---|---|---|---|
OR/WMD (95%CI) | Z | P | I2 | P | ||
Operative time | ||||||
 Before 2010 | 3 | − 8.22 (− 23.46, 7.01) | 1.06 | 0.290 | 51.4 | 0.128 |
 After 2010 | 6 | − 3.28 (− 14.91, 8.35) | 0.55 | 0.580 | 76.6 | 0.001 |
  Retrospective cohort study | 8 | − 3.22 (− 13.68, 7.24) | 0.60 | 0.547 | 71.9 | 0.001 |
  Non-retrospective cohort study | 1 | − 12.00 (− 16.29, − 7.71) | 5.48 | 0.000 | NA | NA |
 Laparoscopic | 5 | − 8.08 (− 22.21, 6.05) | 1.12 | 0.262 | 69.2 | 0.011 |
 Open | 4 | − 1.25 (− 15.59, 13.09) | 0.17 | 0.864 | 85.5 | 0.000 |
Blood loss | Â | Â | Â | Â | Â | Â |
 Before 2010 | 2 | − 45.69 (− 94.15, 2.77) | 1.85 | 0.065 | 74.0 | 0.050 |
 After 2010 | 5 | − 5.16 (− 17.47, 7.15) | 0.82 | 0.411 | 0.0 | 0.612 |
  Retrospective cohort study | 6 | − 6.01 (− 17.87, 5.85) | 0.99 | 0.321 | 0.0 | 0.709 |
  Non-retrospective cohort study | 1 | − 67 (− 90.2, − 43.73) | 5.64 | 0.000 | NA | NA |
 Laparoscopic | 4 | − 3.6 (− 17.44, 10.24) | 0.51 | 0.610 | 0.0 | 0.535 |
 Open | 3 | − 33.53 (− 73.60, 6.53) | 1.64 | 0.101 | 81.6 | 0.004 |
Gastritis | ||||||
 Before 2010 | 7 | 0.22 (0.06, 0.79) | 2.31 | 0.021 | 75.0 | 0.001 |
 After 2010 | 1 | 0.23 (0.01, 6.09) | 0.89 | 0.376 | NA | NA |
  Retrospective cohort study | 6 | 0.16 (0.07, 0.40) | 3.98 | 0.000 | 13.9 | 0.325 |
  Non-retrospective cohort study | 2 | 0.88 (0.13, 5.88) | 0.13 | 0.898 | 45.9 | 0.174 |
 Laparoscopic | 1 | 0.23 (0.01, 6.09) | 0.89 | 0.376 | NA | NA |
 Open | 7 | 0.22 (0.06, 0.79) | 2.31 | 0.021 | 75.0 | 0.001 |
Delayed gastric emptying | ||||||
 Before2010 | 2 | 0.64 (0.21, 1.96) | 0.79 | 0.430 | 0.0 | 0.832 |
 After2010 | 9 | 2.26 (1.43, 3.59) | 3.46 | 0.001 | 34.6 | 0.141 |
 Retrospective cohort study | 10 | 1.74 (1.09, 2.77) | 2.31 | 0.021 | 41.6 | 0.080 |
  Non-retrospective cohort study | 1 | 2.69 (1.04, 6.97) | 2.04 | 0.041 | NA | NA |
 Laparoscopic | 7 | 3.03 (1.60, 5.73) | 3.41 | 0.001 | 26.3 | 0.228 |
 Open | 4 | 1.23 (0.69, 2.20) | 0.69 | 0.492 | 32.0 | 0.220 |
 Length< 3 cm | 1 | 0.56 (0.12, 2.72) | 0.72 | 0.474 | NA | NA |
 Length> 3 cm | 7 | 2.34 (1.33, 4.13) | 2.94 | 0.003 | 28.6 | 0.210 |
 Length NA | 3 | 1.70 (0.84, 2.84) | 1.48 | 0.138 | 60.3 | 0.080 |
Body weight change | ||||||
 Before 2010 | 5 | 3.69 (2.53, 4.84) | 6.26 | 0.000 | 0.0 | 0.429 |
 After 2010 | 3 | 2.22 (0.02, 4.43) | 1.97 | 0.048 | 66.5 | 0.050 |
 Retrospective cohort study | 7 | 3.18 (1.54, 4.83) | 3.79 | 0.000 | 63.2 | 0.012 |
  Non-retrospective cohort study | 1 | 3.70 (2.02, 5.38) | 4.31 | 0.000 | NA | NA |
 Laparoscopic | 1 | 2.10 (0.06, 4.14) | 2.02 | 0.043 | NA | NA |
 Open | 7 | 3.58 (1.84, 5.33) | 4.03 | 0.000 | 70.3 | 0.003 |